So basically, what I'm trying to do is to hook a static method of a class to another static method of that same class.

Code is here :

class LocatorMap {
    public static function init() {

        add_action( 'wp_enqueue_scripts', array( __CLASS__, 'register_scripts' ) );


    /* add_action( 'wp_enqueue_script', array( 'LocatorMap', 'register_scripts' ) ); */
    public function register_scripts() {

        global $post;

        /* http or https */
        $scheme = parse_url( get_bloginfo('url'), PHP_URL_SCHEME );

        /* register gmaps api and info box */
        wp_register_script( 'google-maps-api', $scheme . '://maps.googleapis.com/maps/api/js', array('jquery'), FALSE, true );
        wp_register_script( 'google-maps-info-box', $scheme . '://cdn.rawgit.com/googlemaps/v3-utility-library/infobox/1.1.13/src/infobox.js', array( 'jquery', 'google-maps-api' ), '1.1.13', true ); 


Is this possible? I don't know since I'm a bit new on this kind of a structure.

UPDATE I am also calling this class on an external file.

define( DEALERSHIP_MAP_URL, untrailingslashit( plugin_dir_url( __FILE__ ) )  );
define( DEALERSHIP_MAP_DIR, untrailingslashit( plugin_dir_path( __FILE__ ) ) );

require_once( 'core/class-locator-map.php' );

register_activation_hook( __FILE__, array( 'LocatorMap', 'init' ) );
  • yes it's possible and you did it right, did you get any error?
    – GKS
    Dec 6, 2016 at 4:43
  • Hi @GovindKumar was not getting any error, however the scripts are not enqueued when I view the source of the page. I did use wp_enqueue_script function I just forgot to include it on my example. sorry. that class LocatorMap is being hooked to the register_activation_hook function as include_once( 'inc/class-locator-map.php' ); register_activation_hook( __FILE__, array( 'LocatorMap', 'init' ) ); Dec 6, 2016 at 5:05

3 Answers 3


register_activation_hook only runs once i.e. when the plugin is first activated - use the init hook instead to "boot up" your plugin:

add_action( 'init', 'LocatorMap::init' );
  • 1
    ahh yeah, I only need to register the scripts once. so I kinda use that register_activation_hook can I use the add_action( 'init', array( 'LocatorMap', 'init' ) ); ? but init maybe do it too. I think? Dec 6, 2016 at 22:16

use the function get_called_class()

public static function init() {
    add_action( 'wp_enqueue_scripts', array( get_called_class(), 'register_scripts' ) );

I recently had to do the same thing and ended up using the static:: late static binding along with special ::class constant. The static:: binding will reference the calling class, while the ::class constant will return a string that is the name of the calling class (with namespacing!)

Using the example from the questiom, the implementation would like something like this:

class LocatorMap {
    public static function init() {
        add_action( 'wp_enqueue_scripts', array( static::class, 'registerScripts' ) );

    public function registerScripts() {}

Since static:: references the calling class, this allows to write reusable classes for your plugins/themes, and kind of wrap up some of WordPress' legacy ugliness.

For example, you could write an abstract class for custom post types like this:

namespace WordpressPlugin;

abstract class AbstractPostType {
  const SLUG;

  private function __construct() {}

  public static function initialize() {
    add_action( 'init', array( static::class, 'registerPostType' ), 0 );
    add_action( 'init', array( static::class, 'registerTaxonomies' ), 1 );
    add_action( 'add_meta_boxes', array( static::class, 'addMetaBox' ) );

  public static function registerPostType() {}

  public static function registerTaxonomies() {}

  public static function addMetaBox() {}

Aftet that, you can now create custom post types without having to duplicate all of the boilerplate in each subclass, like this:

namespace WordpressPlugin;

class ExamplePostType extends AbstractPostType {
  const SLUG = 'example-post-type';

  public static function registerPostType() {
    register_post_type( self::SLUG, array(
    ) );

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